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Fat tire riders look like "fat heads."



 
 
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  #61  
Old July 9th 20, 01:29 AM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 4,018
Default Fat tire riders look like "fat heads."

On Wed, 08 Jul 2020 14:39:55 -0700, Jeff Liebermann
wrote:

On Wed, 08 Jul 2020 07:46:16 +0700, John B.
wrote:

Ah well, my calculator were "rounded" a bit so perhaps my numbers are
a bit off. So in the pursuit of greater accuracy one watt should be
referenced as 0.00134102209244049000 hp.


Umm... which type of horsepower is that?
https://en.wikipedia.org/wiki/Horsepower
Imperial, mechanical, metric, electrical, boiler, hydraulic, or air
HP?


I forgot about "tax horsepower":
https://en.wikipedia.org/wiki/Tax_horsepower
At the beginning of the twentieth century, tax power
was reasonably close to real power; as the internal
combustion engine developed, real power became larger
than nominal taxable power by a factor of ten or more.

Tax or fiscal HP is different for every country. In some countries
(Switzerland) different for each canton or state. If a government
needs more revenue, it just tweaks the formula.



--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
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  #62  
Old July 9th 20, 02:38 AM posted to rec.bicycles.tech
AMuzi
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Posts: 13,447
Default Fat tire riders look like "fat heads."

On 7/8/2020 7:29 PM, Jeff Liebermann wrote:
On Wed, 08 Jul 2020 14:39:55 -0700, Jeff Liebermann
wrote:

On Wed, 08 Jul 2020 07:46:16 +0700, John B.
wrote:

Ah well, my calculator were "rounded" a bit so perhaps my numbers are
a bit off. So in the pursuit of greater accuracy one watt should be
referenced as 0.00134102209244049000 hp.


Umm... which type of horsepower is that?
https://en.wikipedia.org/wiki/Horsepower
Imperial, mechanical, metric, electrical, boiler, hydraulic, or air
HP?


I forgot about "tax horsepower":
https://en.wikipedia.org/wiki/Tax_horsepower
At the beginning of the twentieth century, tax power
was reasonably close to real power; as the internal
combustion engine developed, real power became larger
than nominal taxable power by a factor of ten or more.

Tax or fiscal HP is different for every country. In some countries
(Switzerland) different for each canton or state. If a government
needs more revenue, it just tweaks the formula.




Your last sentence pithily sums up the issue of Illinois'
constitutional change proposal at referendum next November.

https://chicago.suntimes.com/2020/2/...u-need-to-know

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #63  
Old July 9th 20, 05:32 AM posted to rec.bicycles.tech
Jeff Liebermann
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Posts: 4,018
Default Fat tire riders look like "fat heads."

On Wed, 08 Jul 2020 19:36:51 -0400, Radey Shouman
wrote:

Jeff Liebermann writes:
I then assumed that the cube rule would also work in the opposite
direction. To move the wind twice as fast requires eight times the
energy driving the motor and turbine. Again, notice that there's no
distance involved, yet. However, if I place a bicycle in the air flow
with a sail to catch the wind, the bicycle would be traveling at the
same speed as the wind. The bicycle will still arrive in half the
time, but because the 8x energy had already been delivered to the wind
by the motor and turbine, it still requires eight time the energy to

^^^^^^
There's your problem -- it requires eight times the *power*, but only
four times the total energy. Power is energy (or work) divided by time. If
you quadruple the force retarding your bicycle, and also double the
speed (distance divided by time), then you'll have to deliver eight
times the power (distance multiplied by force divided by time).


Y'er right. Mixing power and energy is where I made my mistake.
That's the same explanation provided by Ralph and Frank, but I didn't
understand it until now. Thanks for the correction.


--
Jeff Liebermann
150 Felker St #D
http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
 




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